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unfailing (adj.)
[unfailing 词源字典]
late 14c., "never coming to an end, unceasing, everlasting, inexhaustible," from
un-
(1) "not" + present participle of
fail
(v.). Related:
Unfailingly
.
[unfailing etymology, unfailing origin, 英语词源]
[unfailing 词源字典]